A Study on Acute Toxicity, Behaviour and Growth in Indian Flying Barb, Esomus Danricus (Hamilton-Buchanan) on Exposure to Organochlorine Pesticide, Endosulfan (Ec 35)

Acute toxicities, in terms of median lethal concentrations (LC₅₀), of commercial grade endosulfan on Esomus danricus, a teleost commonly found in shallow streams and floodplain wetlands of Assam, India at 24, 48, 72 and 96 hours were 22.48, 13.2, 7.97 and 4.94 μg l⁻¹ respectively. Behaviour of exposed fish was noted upto 96 hours of exposure. Effects of three sublethal concentrations of endosulfan on growth and somatic indices during 28 day exposure period revealed a decline in body weight accompanied by a dose and exposure dependent increase in hepato-somatic index and decline in brain and kidney-somatic indices.